Size indicator for surface grinders



24 *fri* lNvErqTm Y ATTORNEY Filed Feblsa.. 192s c KNwLEs SIZE INDICATORFOR SURFACE GRINIERS April 3, 192s.

Patented Apr. 3, 1.928.

" UNlTEn STATES KNOWLES, OF HARTFORD,

CARROLL COMPANY, OF NEW YORK,

CONNECTICUT, ASSIGNOB TO. PRATT & WHITNEY N. Y., A CORPORATION OF NEWJERSEY.

SIZE INDICATOR FOB. SURFACE GLRINDERS.

Application med February 19, 1923. Serial No. 620,022.

This invention relates to an indicator adapted to be applied to and usedin connectiony with a surface grinder -to indicate when the work beingoperated on has been broght down to its final dimension.

More particularly this invention relates to an indicator adapted to bedirectly mounted on a fixed art of the machine and adapted to be move toits operative and inoperative .positions by movement of one of theelements of the grinding machine.

y.A principa tion is to provide an improved form of size indicatoradapted to Contact with the work and indicate the progress of thegrinding operation. It is also an object of the invention to providemeans for supporting and guiding the indicator so that it may beautomatically moved into-and outof opera- 20 tive positionsimultaneously with the normal movements of the wheel head, or othermovable part of the grinder during operation of the grinder.

Another object of the invention is to provide a form of indicator whichwill automatically reset itself to precisely the proper position eachtime the movable part of the grinder is brought'to its o erativeposition so that a large number o identical parts maybe ground and theindicator used thereon without necessitating individual preliminaradjustments.

. Anot er feature which is advantageous is 'that means are providedwhereb adjustments of the indicator may be rea ily made to .adapt it foroperating upon different thicknesses of work. y

The invention shown and described herein is adapted particularl -for usein associa- 40 tion with the form o surface grinder disclosed andclaimed in my Patent No. 1,458,623 granted me June 12, 1923.

With these and other objects in view, my invention consists in thefeatures of cong5 struction and operation set forth in the followingspecification and illustrated in the v accompanying drawing.

In the accompanying drawing annexed hereto and-forming a part of thisspecification, I have shownI my invention embodie in a vertical surfacerinding machine but it will be understood t at the invention can beotherwise embodied and that the drawing is not to be construed asdefining or so limiting the scope of the invention, the

object of the present inven- A be understood that c vface grinder ofclaims appended to this specification being relied upon for thatpurpose.

.In the drawing: Y lFigure 1 is a side elevation of a portion of asurface grinder having the present invention applied thereto.

Fig.l 2 1s a frontelevation on a smaller scale of the'indicator auditssupporting means.

Fig.. 3 is a detail view of a partof the invention. t

Fig. 4 is a fragmentary view of the connection between the support andthe indicator.

In the above mentioned drawing, I have shown but one embodiment' of theinvention which is now deemed referable but it is to anges andmodifications ma be made withinthe scope of the appende claims withoutdeparting from the spirit of the invention. p

Briefly, my invention in its broadest aspect comprises thefollowingrincipal parts: First, a surface grinder o conventional'form having awork supportin table on which work may be mounted -an suit-v ably heldin fixed position; second, an abrasive wheel rotatably mounted andpreferably movable toward and from the surface of the work supportingtable; third, means to raise and lower thev wheel head and wheel 'out ofand into lts operative position;

fourth, a fixed support in which the body member of the indicator isslidably mounted; fifth, an indicator having an elongated member adaptedat its lower end to contact with work mounted on the table and at itsupper end to be associated with a dial indicator; and sixth, means onthe movable element of the grinder to move the indicator out of itsoperative position each time the wheel is raised from the table andpermit it to move back to its predeterminedoperative position when thewheel head is again moved toward the work.

' Referring more in detail to the es of the drawing, the operative partso a surv a typical or conventional a rotating work supporting form areshown,

d, table being indicated at 10. Adjacent therel06 to is rotatablymountedI an abrasive wheel 11. This wheel 1 1 is referabl mounted in avertically movablew eel hea 12,. the posir tion of which can be variedby oscillation of the hand lever 1.3 as shown. The pulley 14 1,10

mounted on the spindle l carrfying the abrasive wheel 11 provides meansVor rotating the Wheel. well known parts of a conventlonal form ofgrinder, a further ,description of'them will Ibe unnecessary.

'Preferably surrounding the work sudpporting table 10 and the wheel 11is a, guar meinber 20. This is in the form of a vertical semi-vcylindrical wall enclosing the rear portions of the table 10 and theabrasive wheel 11. On the upper portion 'of this guard 20 is mountc `eda support 21 which may be rigidly held thereon by suitable clampingbolts 22. As -shown this support 21 is provided with an inclined opening23 extending `completely therethrough and through which extends the bodymember 24 of the indicator forming the present invention. Y

The support 21 is referably provided with an-upwardly extending arm2lahav'mg an opemng 23'in alignment with opening 23.

"By means -of this arm 21a and its opening 23a the body member 24 of theindicator isv adapted to be supported at two widely difierent points.-The body member 24 o the in-` dicator is. preferably adjustably mountedwithin a sleeve 25, the lower end of which is provided with a flange 26and which in its their operative position.

Within the body member 24 of the indicator is slidably mounted anelongated *rod y 30, the lower end of which is provided with a contactmember 3L adapted to rest upon work A mounted on the work table IQ. Theopposite end of the rod 30 is adapted to contact with the spindle 32 ofa dial indicator 33. It will be seen from the above that with the bodymember 24 mounted within and slidable up and down in the support 21 and'with .the s the button 27, the\de vice will be in operative position.-Also with the contact 31 on the rod 30 in engagement with the work, theposition of the pointer 34 on.' the dial indicator 33 will indicateexactly tive `thickness of the work pieces A. Continued operation of thewheel 11 and its abrasive action on the work A will be indicated bmovement of the pointer 34 on the dial in icator 33.

Preferably the` adjustment between vthe body member 24 and the sleeve 25comprises interengaging threaded portions. By ro- As the above parts arethe supporting eeve 25 in contact with the comparaincassa member 24, thevertical position of the body member 24 andthe parts contained thereinmay be widel varied for different thicknesses of work being ground, Alsothis rotatin of the sleeve 25 permits adjustment of the device forvarying thicknesses of work without necessitating changing the positionlof the support 21 and its contact member 2:?. At its.lower end the bodylmember 24 is provided with a' longitudinal groove 35 and on the support21 is a screw36 adapted to enga e it so that no rotation ofthe body memer-24 can take place. Also a screw 3 7 may be rovided inthe sleeve 25 sothat when adjusted the sleeve 25 may be locked in position'. l

During the use of the indicator on'a-plu-I rality of .pieces ofidentical final thickness no adjustments -whatever are required. It isonly when the character of work vbeing ground is changed that the axialposition of the member 24relative to the sleeve 25 is required to beadjusted. l

In operating upon certain types of work` pieces on the table 10 it maybe impossible to allow the contact `31 to continuously rest on the work.I therefore rovide a resiliently mounted detent 38 within the extension21n of the support 21 and adapted to engage the lower surface of thecollar4 28 to Hold the body member 24-and its attached parts in theirinoperative position,l

" In .the use vof this invention, itis desirable to rst quickly set theindicator device precisel in its predetermined position for a num er ofidentical pieces, the indicator'not thereafter requiring adjustmentsuntil the dimensions of the work being operated upon are changed. Forthis purpose, the indicator preferably may be adjusted by means of gageblocks of the thickness desired being placed upon the table 10 incontact with the contact member 31 onthe indicator rod 30 and theposition of the pointer of the dialindicator brought to a zero mark byrotation o f vthe sleeve l25 or adjustments within the -indicator 33itself. With this preliminary adjustment given the indicator, it is onlynecessary toV raise and lower the wheel head 12 as required in thenormal or usual operationl of the machine to move the indicator into andout of -its operative position. Also each downward movement of the wheelhead 12 vwill permit the body member 24 and sleeve 25 to move downwardto an exact predetermined position determined by the button 27 A' andthe adjustment of the body member 24. It will also be seen that witheach upward movement of the hand lever v13 to enable work A to bechanged on the supporting table 10, the indicator is also elevated-soasto be entirely removed from its operativeposition. This takes lace breason of the engagement ofthe co ar A28 y the yoke29.

Downward movement of the hand lever 13, however, permits advancement ofthe body member 24 into operative position until the contact button 27on the support 21 engages the lower surface of the sleeve 25. Continuedoscillation of the lever during the grinding operation causes the rod 30within the body member 24 to move relative to this member 24 tliusshowing the progress of the grinding operation by pointer 34 on the dialindicator 33.

What I claim is:

1. An indicator device for surface grinders comprising in combination, afixed support, an indicator movably mounted on the support, means toremove the indicator from its operative position and return it to itsoperative position, said means being operated by movement of the wheeltoward and from 'the work supporting table of the grinder.

2. An indicator device comprising in combination, a fixed supporttherefor provided on said grinder, abody member slidable relative tosaid support, means to limit the movement of the body member in onedirection, a rod slidable within the body member adapted to be axiallymoved during operation as the work is being ground, said movement beingadapted to influence an indicator, and means to move the body member toinoperative position with movements of the wheel head.

3. An indicator device for surface grinders comprising in combination, asupport fixed relative to the work supporting table of the grinder, abody member slidable relative tov said support, means to limit themovement of the body member in one direction, a rod slidable within thebody member adapted at one end to engage the work being groun and at itsopposite end to contact with an indicator, anda detent'adapted tosupport the body member in inoperative position during o eration of thegrinder.

4. n indicator device for surface grinders comprising in combination, asupport iix relative to the work supportin table of the grinder, a bodymember sli able relative to said support, means to limit the movement ofthe body operative position, and vmeans to move the oscillation of the'for surface grinders member while inv body member to an inoperativeposition with move ent of the wheel head out of operative position.

5. An indicator device for surface grinders comprising in combination, asupport e relative to the work supportin table of the grinder, a bodymem er sli able relative to said support, means to limit the A'movementof the body member` while in operative position, and means to move thebo y member into and out of operative position wit correspondingmovements oi the wheel head.

l6. An indicator device for surface grinders comprising in combination,ort iixed relative to the work supportin grinder, to said support, meansment of the body member position, means to move the body member to aninoperative position with'movement of the wheel head lout of operativeposition, and means on the support adapted to retain the body member ininoperative position.

7. An indicator device for surface grinders comprising in combination',a fixed support therefor on the grinder, a body member slidable withinthe sup ort, a sleeve surrounding the body mem r and adjustablyconnected thereto, a contact member on the support adapted to engage thesleeve to control the operative'position of the body memto remove theber and s1eeve,. and means body member from operative position withmovements of the operative parts o the grinder. l

8. An indicator device for surface grinders comprising in combination, afixed support therefor ,on the grinder, a body member slidable withinthe support, a sleeve surrounding the body member and threaded theretowhereby the body member and sleeve are axially ad ustable, a contactmember on the support a apted to en age the sleeve to control theoperative posiA ion of the body member and sleeve, and means to removethe body 'member and sleeve from operative position with movements ofthe operative parts of the grinder. y

In testimony whereof, I hereunto affix my signature.

CARROLL KNOWLES.

